Type-writing machine.



A. T. BROWN.

TYPE WRITING MACHINE.

APPLICATION FILED JULY 22, 1907.

910,900, Patented Jan. 26, 1909.

9 n L J WITNESSES: iNvENTEJR= zw. m I WMYM H15 ATTIIIRNEY UNITED STATES PATENT onrron.

ALEXANDER T. BROWN, OF SYRACUSE, NEW YORK.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Patented Jan. 26, 1909.

Applicationlfiled July 22, 1907; Serial No. 384,926.

chines and it has for its principal object to provide an improved type bar pivotal bearmg.

bar with spring means which normally press the ball bearings together but which are adapted to yield in case one of the, balls meets with seine obstruction such as a particle of dirt, or in case of anything tending to deflect the type bar, such as two type bars coliiding when two keys are struck at the same time or, in case of any rough handling, such as may occur when the types are being cleaned. The bearing is very readily assembled and it is self adjusting.

' To the above and other ends which will hereinafter appear, my invention consists in certain features of construction and combination and arrangements of parts, all of which will be fully set forth herein and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a side view of a Lype bar and hanger made in accordance with my invention, a type bar segmentbeing shown in section and a platen being shown diagrammatically. Fig. 2 is a top or edge view of the type bar and its han er. 1 ig. Sis an enlarged view in section on t e line ;r'x of Fig. 1. Fig. 4 is a side view of the type bar with the head of the pivot pin sectioned away. Fig. is a view of the opposite side of the type bar. Fig. 6 is a side view of the .hanger with the pivot pin in section. Fig. 7 is a view of the hanger as seen from the opposite side.

My invention is ap licable to typewriting machines generally, ut in Fig. 1 I have shown a type bar and hanger mounted near the center of the segment. of a front -strike typewriter. In this figure, 1 designates the segment and 2 the platen. The hanger com-- rises a hanger arm 3'having the form of a at plate with its plane parallel. to that in ear or foot 4 perforated at 5 for the reception of a screw 6 bvwhich the hanger is secured to I provide a ball bearing pivot for a type the segment}. In the construction shown I the foot 4 is secured to the inner or upper face of the segment, and the plate-like arm 3 projects toward the front of the machine; ut this specific arrangement is not essential as the hanger may be secured to'the segment in other ways and project from the segment in other directions without departing from my invention.

The forward art of the hanger arm 3 is perforated for tl fe receptionof a pivot in 7 which, in the particular form thereof s own in the present instance, is formed or provided with a broad flat head 8. A V-groove 10 is formed in one face of the hanger arm 3 concentric with the pivot pin 7 and in this V- I groove there runs a set of anti-friction balls 11. The type bar 12, having a type or tvpes 1 3011. its free end, is formed atits pivotal end with a circular enlargement 14, one face'of which lies against the grooved face of the hanger arm 3 and has formed in said face a 'V-groove which, together with the groove 10 forms a race-way for the balls 11. Concentricwith said groove 15 the ty e bar is formed with a central opening 16 aving a tapered or conical bearm face 17 a ainst which bear the inner set ofialls 18, sai balls cooperating with the periphery of the ivot pin 7 and with the inner flat face of the ead 8 of said in. The pivot pin 7 does not have a tight t in the hanger arm 3 but has a working fit therein and said pin projects a short distance beyond the hen er arm where itis-formed with a transverse s ot into which fits the end of a flat'spring 20, the o posite end of said spring being secured to thehanger arm 3 by a screw 21. The spring 20 exerts its tension away from the hanger arm so that said springtends to press the head 8 of the pivot pin against the ballslS, thus forcing said balls against the inclined bearing surface 17 .of the type bar and pressing the type bar itself against the outer set of balls 11. Oneof the walls of the slot serves as a shoulder or abutment on the pin against which the spring 20 acts. The halls and grooves are so proportioned that: the type bar lies retty close to the hanger arm but .With su 'cient space between for easy clearance, and the head 8 of the pivot pin is also but a short distance.

7 from the face of the type, bar. which the-type bar swings, and a bent-off When the parts are assembled the spring 20'doesnot ie flat against the hanger arm but. stands out fromit a short distance, as

best shown in Fi 3 so that in caseany unon any of the parts.

to deflect it or to move it in a-direction transverse to the plane in which it swings, the

spring may yield a short distance without bending the type bar or placing undue strain The spring 20' normally stands so close to the hanger arm, however, that the type bar cannot be deflected to a suflicient extent to allow the balls to become displacedfrom their grooves and when the extraneous force is removed the parts spring back instantly into their normal and proper relations. When the type bar is deflected to such an extent that the spring 20 is drawn down flat against the face of the hanger arm the parts are positively prevented from moving any further. Moreover, in case of wear in the bearing,- said wear is automatically. taken up by this spring'20. Furthermore, in case of dirt getting into the bearing and into the path of one of the balls, the ball can ride over the particle of dirt without putting undue strain on the parts, the spring permitting suflicient yielding of the bearing for the purpose. It will, of course, be understood that the spring is so adjusted as to place-'thebearing under a suitable amount of tension, great enough-to insure that the type bar be guided accurately to the'printing point and not so reat as to place undue pressure on the ball l caring and thus cause it to work hard. It

will be observed that the sprin 20 which presses one member of the type ar pivotal earin towards the cooperating member thereo is separate from the type bar and from the hanger, although it is attached to one of them. I am thus enabled to employ a rigid type bar and a rigid han er, and at the same time to bearing together yspring pressure. The outer grooves 10 and 15 are of sufficient diameter to aflord-a wide bearing for the type bar and thus guide it accurately in its motion, this width of bearing being approximately in the plane in which the type bar swings. The grooves 10 and 15 being of the V-shapeshown, prevent any bodily motion of the typebar across its 'axis'of swinging motion'and guide thetype bar in a true circular path a out the axis of the pivot pin 7.

The bearing may be readily taken apart and the type bar disconnected from the .hanger by turning the spring 20 about the securing screw-21, thus slipping the end of the spring out of the slot in the pin 7, and then withdrawing said pin from the hole in thehanger arm. This operation is'the work of but a moment and the parts may-be very readily replaced by reversing this operation. It will be seen that when the hanger is assembled no adjusting of it is necessary, once the proper tension has been secured on the spring 20, as said spring keeps the bearing automatically in adjustment.

by Letters Patent, is

ress the mem ersof the Any suitable means may be rovided for actuating the type bar. As s own in the present instance said bar is formed with a depending arm 22 to which is pivoted a for wardlynextending actuating link 23 which may belconneoted up with .a key in any suitable manner. j v

The opening 17 in the type bar isso designed t at the balls 18 project but a short distance beyond the face of the type bar, said balls being nearly included in said opening. It will be seen that both sets of balls run in circles the planes ofwhich are parallel to and are nearly coincident with the plane' of motion of thetype bar itself, and that one of these circles is of greater diameter than the other. Y

Various 7 changes may be made without departing from the spirit and scope of my invention.

What I claim as new and desire to secure 1. In a typewritmgmachine, the combination of a type bar and a support therefor, a pivotal connection between said type bar and its support, saidpivotal connection arranged to afford lateral movement of said type bar independently of its support, and spring means resisting such lateral movement.

2. a typewriting machine, the coinbination of a type bar and a support theretype bar independently of its support, spring means resisting such lateral movement, and means for limiting the extent of such lateral movement.

3. In a typewriting machine, the combination of a type bar and a support there for, ball bearings for said type bar, and spring means for pressing the ball bearing members together, said sprin means being adapted 'to afford a materia deflection of said type bar.

4. 1n a typewriting machine, the com bination of a type bar and a sup ort there'- for, ball bearings for said type in, spring means for pressing the ball bearing members together, said spring means being adapted to aflord a material deflection of said type bar, and means for limiting the extent of such deflection.

5. In' a typewriting machine, the combination of a ty e bar and a hanger arm arranged face to iace, a ball bearing between the proximate faces of said type bar and comprising a spring capable of yielding to a material extent. 1

6. In a typewriting machine, the combi nation of a type bar, a hanger arm for said type bar. a pivot pin passing through oneof said parts andhaving ball-bearing connection with the other, .and a springacting on said 7. In a typewriting machine, the combination of a type bar and hanger arm arranged face to face and'having ball bearing rooves in their proximate faces, anti-friction alls in said grooves, a pivot passing through said type bar and hanger and having ballbearing connection with oneof them, and a springacting on said pin and'pressing said type bar toward said hanger.-

8. In a typewriting machine, the combi-.

nation of a type bar and 'a support therefor,

a'bearing for said type bar on'said support,

said bearin being Wide ap roximately in the plane in w 'ch the type bar swings, and a yielding connectionbetween said type bar and said support for yieldingly-holdingthe members of said bearing together- 9. In a typewriting machine, the combination of a ty e bar, a support therefor, a ball bearing 0' wide diameter between said type bar and its support, said ball bearing being adapted to resist motion of said type .bar across the ivotal axis thereof, and yielding means acting on said ty e bar near its ivotal axis for yieldingly ho ding the memers of said balL-bearing together.

10. In a typewriting machine, the cornbi-' nation of a type barand a hanger arm arranged face to face, a pivot pin passing loosely through said parts, and a flat spring mounted on one of said parts and acting on said pin to press the type bar toward the hanger arm.

11. In atypewriting machine, the combination of a type'bar, a hanger arm, a pivotal connection between said parts comprising a acting against said abutment to nation of a type bar, a support for said type. 1 bar, a pivot pm tor said" type bar having an abutment, and a pivoted retaining device for .said pin,said device normally engaging said abutment and ada ted to be turned about its pivot to free sai pin.

- 1.4. In a typewriting machine, the combination of a type bar, a support for said type bar, a pivot pin for said type bar having an abutment, and a pivotedplate spring normally engaging said abutment and retainin said pin 1n place, said spring being adapter to be turned about its pivot to free said pin.

:15. In a typewriting machine, the combination of a type bar and a hanger arm arranged face to face, and a spring acting to press said type bar toward said hanger arm.

16. In a typewriting machine, the combination of a type bar, a hanger, and a spring acting to press said type bar toward the hanger arm.

Signed at Syracuse, in the county of Ononda a, and State of New York, this 12 day of Jul y A. D. 1907.

ALEXANDER T. BROWN.

Witnesses:

' ARTHUR J. BRIGGS,

C. E. TOMLINSON. 

